摘要:
The invention relates to a method and to devices for starting up an electric drive of an elevator. In the method a sensor that detects the direction of movement of the elevator car is fitted into the elevator system, the elevator car is brought into a state of movement, the direction of movement of the elevator car is detected from the measuring signal of the aforementioned sensor that detects the direction of movement of the elevator car and also the drive direction of the electric drive is connected in the control of the electric drive to the detected direction of movement of the elevator car.
摘要:
The present teaching relates to a magnetic sensor (1105) including an input port (1102, 1104) and an output port (1106) and an electrical circuit (1100) which includes a magnetic field detecting circuit (1130), an output control circuit (1120), a state control circuit (1140) coupled with the output control circuit (1120) and configured to determine whether a predetermined condition is satisfied and signal the same to the output control circuit (1120). When the predetermined condition is satisfied, the state control circuit (1140) is at least responsive to the magnetic induction signal to enable the output control circuit (1120) to control the magnetic sensor to operate in at least one of a first state and a second state. In the first state, a load current flows in a first direction from the output port (1106) to outside of the magnetic sensor. In the second state, a load current flows in a second direction opposite of the first direction from outside of the magnetic sensor into the magnetic sensor via the output port (1106). When the predetermined condition is not satisfied, the state control circuit (1140) enables the output control circuit (1120) to control the magnetic sensor to operate in a third state.
摘要:
A refrigeration apparatus (1) includes a fan (90) and a motor for driving the fan (90). The motor is a single phase synchronous alternating current motor (10). In comparison with the traditional motor, the single phase synchronous alternating current motor (10) has a reduced size and reduced cost, while ensuring the stable performance.
摘要:
A method of and an apparatus for starting a piston type compressor (C) driven by a permanent magnet synchronous motor (M) controlled by a frequency converter (FC), the method comprising at least following steps: a) indicating the position of the piston highest pressure point and aligning the rotor of the motor (M) at the optimal starting angle prior to the actual compression operation by providing a pre-pulse to rotate the rotor of the motor (M) at least one full rotation at a certain frequency (f 2 ), during rotation measuring the load torque by means of the frequency converter as well as indicating the maximum load torque point and at the end aligning the rotor of the motor (M) at the optimal starting angle of about 180° from the maximum pressure angle, and b) at the beginning of the actual compression operation setting the rotor position opposite to the maximum torque angle by feeding direct current to the stator winding and starting the motor by supplying maximum motor current to the motor to give the maximum torque and acceleration.
摘要:
A rotary tool driven by a brushless motor, which can always appropriately and efficiently perform constant torque tightening work of screws, in which downsizing of the entire device and improvement of torque control accuracy are easily achieved, and conventional problems such as sparks occurring at switch contacts, wear, and negative effects to peripheral electronic apparatuses, electronic circuits, etc. are removed to reduce the sizes of and extend life of constituting components. A lever operation mechanism (20) as a drive switch or first Hall elements (31a, 31b) for detecting each operation of a push scan mechanism (18) and a second Hall element (32) for detecting clutch actuation are installed. Control means (50) is constructed such that a DC brushless motor (12) is rotatingly driven based on an operation signal by the first Hall elements (31a, 31b) and the drive is stopped based on an actuation signal of the second Hall element (32).
摘要:
A drive circuit for a brushless DC motor (100) controls at least one of a number of possible operation features of the motor. The drive circuit includes a driver stage for providing a current for a stator coil and varies which of the number of possible operation features of the motor are controlled. The operation features of the motor include inrush current limit control, PWM speed control, analog speed control, detecting a locked rotor condition, setting an alarm following detection of the locked rotor condition, restarting the motor following the locked rotor condition, detecting a low speed condition, and setting an alarm following detection of the low speed condition. Some of the operation features of the motor utilize at least one parameter that defines the desired operation of the feature. The drive circuit further varies the parameters of the operation features without changing the physical configuration of the brushless DC motor.
摘要:
Ein elektronisch kommutierter Motor (250) hat einen Stator (210), welchem eine Statorwicklungsanordnung (212, 214) zugeordnet ist, ferner einen Rotor (220), welcher in Wechselwirkung mit dem Stator (210) steht, eine Vorrichtung (215) zur Bestromung der Statorwicklungsanordnung gemäß einem vorgegebenen Bestromungsmuster, welches einem ausgewählten Betriebszustand des Motors (250) zugeordnet ist, einen Sensor (230) zur Erzeugung eines elektrischen Bilds bzw. Abbilds mindestens eines vorgegebenen Segments (205) einer vollständigen mechanischen Umdrehung des Rotors, und eine Auswerteeinheit (240), welche zur Ausführung folgender Schritte ausgebildet ist: A) ein erstes Bild wird mit einem zweiten Bild verglichen, welches nach Ablauf eines n-fachen einer vollständigen mechanischen Umdrehung des Rotors, gemessen ab dem Beginn des ersten Durchlaufs des vorgegebenen Segments (205), erzeugt wird, um eine Information über einen tatsächlichen Betriebszustand des Motors (250) zu erhalten, wobei n = 1, 2, 3, etc. ist; B) auf der Basis dieser Information wird bestimmt, ob der tatsächliche Betriebszustand des Motors (250) dem ausgewählten Betriebszustand entspricht.